digital integrator

Discussion in 'The Projects Forum' started by Chainsaw, Oct 19, 2007.

  1. Chainsaw

    Thread Starter New Member

    Oct 19, 2007
    1
    0
    I'm building an 8-bit digital integrator that will...well... do the same thing an analog integrator does... integrates! ;) I'm only allowed to use discrete parts, with the exception of: an ADC on the front and a DAC on the back. I am having a great deal of difficulty finding literature pertaining to the subject. I know how an analog integrator works, but I'm having a little trouble figuring out how to apply this to the discrete field. Where do I start?

    Thanks,

    -Joe
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If analog integration can be done with a capacitor accumulating charge, and therefore voltage over time, what do you think the digital equivalent might be?
     
  3. BlackBox

    Member

    Apr 22, 2007
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    0
    A digital integrator shuld be as simple as an adder. Figure this: the integral (according to Riemann) of a function is the sum of infinite rects with null area.

    So if you sample and hold a signal some of these rects (the ones in the same sample/hold period) will have the same width and height, so the area of that period will be:

    sample * sample_period

    if you add these up for all samples you have the discrete integral.

    You just have to use some logic to add all the samples from the A/D Converter up and divide them by the sampling frequency...

    Or use a microcontroller :)
     
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